<html>
<head>
  <title>Glarity</title>
  <style>
    html {
      width: 400px;
      height: 600px;
    }
  </style>
  <link rel="stylesheet" href="popup.css" />
</head>
<body>
  <div id="app"></div>
  <script src="popup.js"></script>
</body>
</html>